ANP 1106 Lecture 5: Topic 5 (The Muscular System) Notes

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1106
• Professor: Joanne Savory

Document Summary

Transforms chemical energy (atp) to directed mechanical energy exerts force. Special characteristics: excitability (responsiveness): ability to receive and respond to stimuli, contractility: ability to shorten forcibly when stimulated, extensibility: ability to be stretched, elasticity: ability to recoil to resting length. Additional functions: protects organs, forms valves, controls pupil size. Structural and functional organizational levels of skeletal muscle: Myofibril: complex organelle composed of bundles of myofilaments. Muscles that immobilize the scapula during shoulder joint movements or loads. 4 patterns: circular: fascicles arranged in concentric rings, surround and contract to close opening, ex. Orbicularis oculi: convergent: fascicles converge towards a single tendon insertion, muscle is triangular or fan-shaped, ex. Pectoralis major: parallel: fascicles parallel to the long axis of a strap like muscle, can be strap-like (ex. Biceps brachii: pennate: short fascicles attach obliquely to a central tendon running the length of the muscle, unipennate: ex. Muscle location: bone or body region that the muscle is associated with.